JP5341472B2 - Oil separator built-in compressor - Google Patents

Description

  The present invention relates to a compressor with a built-in oil separator, and more particularly, to a compressor with a built-in oil separator that simplifies and downsizes an oil separator mechanism, reduces the number of parts, facilitates assembly, and reduces pressure loss.

2. Description of the Related Art Conventionally, as a compressor incorporated in a refrigeration system of a vehicle air conditioner, for example, a compressor with a built-in oil separator in which a centrifugal oil separator is built in a compressor is known (for example, Patent Document 1). In a conventional compressor with a built-in oil separator, for example, as shown in an example of a cross-sectional structure of a conventional oil separation chamber 7 in FIG. Gas and oil are separated by utilizing centrifugal force that is introduced into the oil separation chamber 7 and swirls along the inner wall surface of the oil separation chamber 7. In Patent Document 1, the oil separation chamber 7 is formed by a structure in which the fixed spiral body constituting member 5 and the casing 6 are joined by the mating surface 11. In FIG. 6B, 18a indicates an upper side communication hole among the communication holes arranged in the vertical direction, and 18b indicates a lower side communication hole.
JP 2008-82238 A

  In recent years, in response to increasing needs such as an increase in the discharge volume of a compressor, attempts have been made to reduce pressure loss by increasing the cross-sectional area of the communication hole. However, if the cross-sectional area of the communication hole is simply increased with the conventional structure as described above, the following problems may occur.

  That is, when a plurality of communication holes 18 are provided in the conventional compressor with a built-in oil separator having the above-described structure, the cross-sectional area of the communication holes 18 is increased, so that the wall thickness between the adjacent communication holes 18 is increased. If it becomes too small, it becomes difficult to process the casing 6 by casting or forging. Therefore, in order to ensure the thickness between adjacent communication holes, for example, it is conceivable to change the installation position of the lower communication hole 18b further downward. However, as the installation position of the lower communication hole 18b is provided below the oil separation chamber 7, the gas swirl region necessary for separating the oil becomes smaller, leading to a decrease in the oil separation capability of the oil separator.

  Accordingly, an object of the present invention is to focus on the above-described problems and prevent a decrease in the separation performance of the oil separator while reducing pressure loss in the communication hole provided between the discharge chamber and the oil separation chamber. The object is to provide a compressor with a built-in oil separator that is easy to handle.

In order to solve the above problems, an oil separator built-in compressor according to the present invention is disposed adjacent to a discharge chamber, and the entire interior is formed in a space and introduced into a gas and an oil by centrifugation. A separation chamber for separating and dropping the separated oil and extracting the separated gas upward; and a communication hole between the discharge chamber and the separation chamber for introducing the oil-containing gas from the discharge chamber into the separation chamber. In the compressor having a built-in oil separator , the oil separator , the separation chamber, and the communication hole are formed by a combined structure of two members for constituting a compressor, and a part of an inner wall surface of the communication hole is formed in the separation chamber. also formed at a position farther from the mating surface of the mating structure than the inner wall surface of the separation chamber side opening of the communication hole, whose distance is the in the vicinity of the long point from said mating face It consists of, wherein a the communicating hole to bite into the inner wall surface of the release chamber is provided.

  According to the compressor with a built-in oil separator according to the present invention, in the compressor with a built-in oil separator that introduces oil-containing gas from the discharge chamber into the separation chamber and has a communication hole between the discharge chamber and the separation chamber, the oil separator has two members. The oil separator separation chamber is configured by a simple and small structure, and a part of the inner wall surface of the communication hole is located farther from the mating surface of the alignment structure than the inner wall surface of the separation chamber. Thus, pressure loss can be reduced by enlarging the cross-sectional area of the communication hole while maintaining the separation hole in a predetermined capacity while maintaining the installation position of the communication hole as usual.

  In the present invention, it is preferable that the communication hole is formed so as to be opened at a portion of the inner wall surface of the separation chamber that is farthest from the mating surface of the mating structure. Here, the farthest from the mating surface means that the distance from the mating surface is the longest in the member on the side where the communication hole forming portion is processed. By forming the communication hole in this way, it is possible to make it difficult for the dead space of the gas flow to occur when the oil-containing gas is introduced from the communication hole into the separation chamber, and the gas flow flowing into the separation chamber is excellent. Centrifuge performance is provided.

  The present invention is particularly effective when a plurality of the communicating holes are arranged in the vertical direction. That is, when trying to enlarge the cross-sectional area of the plurality of communication holes arranged in the vertical direction, it is possible to reduce pressure loss without changing the arrangement pitch of the adjacent communication holes. In the processing of the casing, it becomes difficult for special difficulties to occur.

  The plurality of communication holes may employ a structure in which the opening directions of the plurality of communication holes to the separation chamber are directed in the same direction. In this way, even when the amount of gas blown into the oil separation chamber is relatively large, the gas blowing direction through each communication hole can be optimized, and efficient centrifugation can be performed in the separation chamber. Thus, it becomes possible to guide the oil separated efficiently to the oil storage chamber. A structure in which the direction of opening to the separation chamber is changed for each of the plurality of communication holes can also be employed. In this way, the direction of the gas blown into the oil separation chamber can be set by changing the angle for each communication hole, and the gas blowing direction can be set in accordance with the shape of the oil separation chamber. The gas blown out from each communication hole can be efficiently centrifuged, and the efficiently separated oil can be guided to the oil storage chamber.

Further, when the arrangement pitch of the plurality of communication holes is P [mm] and the vertical width of each communication hole is W [mm], the communication holes are formed so that the pitch P satisfies the following formula. It is preferable.
W + 2 ≦ P ≦ W + 7

  The meaning of the above formula is as follows. That is, from the viewpoint of casing casting, it is preferable to secure an arrangement pitch of 2 mm or more in addition to the vertical width W of each communication hole, that is, to ensure a thickness of 2 mm or more between adjacent communication holes. In addition, in order to sufficiently exhibit the air curtain effect in the separation chamber, the arrangement pitch is preferably suppressed to within 7 mm in addition to the vertical width W of each communication hole. Here, the air curtain effect means that the gas flow along the separation chamber wall forms a stable swirling flow, and the swirling flow becomes like a curtain, and the separated oil rides on the rising gas flow. It is the effect which suppresses being carried upwards.

  More specifically, the compressor with a built-in oil separator according to the present invention is formed such that the oil separator has a lower hole through which oil separated in the separation chamber is led to an oil storage chamber located below the separation chamber. Is possible. Since such a lower hole can also be formed by a combined structure of two members constituting the compressor, a significant improvement in productivity and cost reduction can be expected.

  In the oil separator built-in compressor in which the oil separator is formed by combining the two members according to the present invention, since the number of parts is small and there is no machined portion, the degree of freedom of the shape of the separation chamber is kept extremely high. . Therefore, the separation chamber can be formed in a cylindrical shape in which the busbar portion extends linearly or in a cylindrical shape in which the busbar portion is curved (a separation chamber having a donut shape as a whole (a shape forming a part of the donut shape)). it can.

  In addition, regarding the cross-sectional shape of the curved cylindrical shape, a substantially perfect circular shape is preferable. However, due to the configuration of the structure of the two members, there are some steps on the inner surface of the cylindrical shape, or the inner surface of the cylindrical shape is A difference in curvature may occur between the arcs in the cylindrical cross section of the member to be formed. In forming the cylindrical inner surface, a difference in circumferential length between the inner surfaces may occur between the two members. Further, there may be a difference between the depths of the arc-shaped grooves in the cylindrical cross section of both members forming the cylindrical inner surface.

  Such an oil separator built-in structure in the present invention can be applied to virtually any type of compressor, but is particularly suitable for a scroll type compressor. In the case of a scroll compressor, for example, one of the two members may be a fixed spiral member and the other may be a compressor casing.

  In addition, the compressor with a built-in oil separator according to the present invention is suitable for downsizing and weight reduction because the oil separator is formed by a combined structure of two members for the compressor configuration. It can be suitably used as a machine.

  Thus, according to the compressor incorporated with an oil separator according to the present invention, the cross-sectional area of the communication hole can be enlarged without changing the arrangement of the communication hole in the conventional structure, thereby reducing the pressure loss, In addition, a casing or the like provided with a communication hole can be formed relatively easily by casting or forging while ensuring desired centrifugal separation performance and processing characteristics. Furthermore, by setting the arrangement pitch of the plurality of communication holes within a predetermined range, it becomes possible to more reliably perform casting or forging while ensuring desired separation performance and processing characteristics. Further, in the oil separator of the present invention, since the matching structure suitable for size reduction and weight reduction is adopted, the compressor incorporated with the oil separator of the present invention is suitably used as a compressor for a vehicle air conditioner. be able to.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a mating structure of an oil separator built-in compressor according to an embodiment of the present invention. The compressor 1 is a scroll compressor, and a discharge chamber 2, a second discharge chamber 3, and an oil storage chamber 4 are formed by a combined structure of a fixed spiral member 5 and a casing 6.

  2 is a view showing a cross section of the compressor 1 of FIG. 1, in which (a) is a cross-sectional view as seen from the AA direction of FIG. 1, and (b) is a cross-section as seen from the BB direction of FIG. FIG. As shown in FIG. 2B, the processing for forming the communication hole 8 is performed on the casing 6 side, and the discharge chamber is formed by the mating structure with the fixed spiral member 5 shown in FIG. An upper side communication hole 8a and a lower side communication hole 8b that connect 2 and the separation chamber 7 are formed. Further, both the casing 6 side and the fixed spiral member constituting member 5 side are processed for forming the lower hole 9, and the lower hole 9 connecting the separation chamber 7 and the oil storage chamber 4 is formed by the combined structure thereof. Is formed. The oil-containing compressed gas compressed by the compression mechanism and introduced into the discharge chamber 7 is introduced into the separation chamber 7 through the communication hole 8 and forms a swirling flow along the inner wall of the separation chamber 7. Preferably, the swirl flow forms a swirl flow that descends along the inner wall of the separation chamber 7, and the oil contained in the gas is separated from the gas by centrifugal separation by the swirl flow, and the separated oil is separated from the gas. It descends along the inner wall of the oil and is stored in the oil storage chamber 4 through the lower hole 9. On the other hand, the gas separated from the oil is introduced into the second discharge chamber 3 through the gas passage 10 while forming an upward flow at the center of the cross section of the separation chamber 7 and discharged from the discharge port to the outside of the system. As described above, the compressor 1 is formed with the oil separator 12 including the separation chamber 7, the communication hole 8, the lower hole 9, and the oil storage chamber 4.

3 shows a cross section of the separation chamber 7 of the compressor 1 of FIG. 2, wherein (a) is a cross-sectional view of the separation chamber 7 as viewed from above in FIG. 2, and (b) is a right side of (a). It is the cross-sectional view of the communication hole 8 seen from. The communication hole 8 connecting the discharge chamber 2 and the separation chamber 7 differs from the conventional compressor shown in FIG. 6 in that a part of the inner wall surface of the communication hole is closer to the mating surface 11 than the inner wall surface of the separation chamber 7. The communication hole 8 is formed at a far position, and the communication hole 8 is opened at a portion of the inner wall surface of the separation chamber 7 farthest from the mating surface 11 of the mating structure. Here, the farthest from the mating surface 11 means that the distance from the mating surface 11 is the longest in the member on the side where the communication hole 8 forming portion is processed. In FIG. The positions of the points Q ₁ and Q ₂ having the longest distance from the mating surface 11 on the processed casing 6 side correspond to this. Thus, by providing the communication holes 8 so as to bite into the inner wall surface of the separation chamber 7 in the vicinity of the points Q ₁ and Q ₂ , the communication holes 8 a and 8 b arranged as shown in FIG. 2B are formed. Since the cross-sectional area of each communication hole 8a, 8b can be enlarged without changing the position in the vertical direction, the pressure loss can be reduced.

  4 is a diagram for explaining the arrangement pitch P of the communication holes 8 and the vertical width W of each communication hole 8. FIG. 4A is an enlarged view of the vicinity of the separation chamber 7 in FIG. ) Is a diagram corresponding to FIG. As can be seen from the figure, for example, when P is equal to W + 2, the wall thickness between adjacent communication holes 8 is 2 mm, and when P is equal to W + 7, the wall thickness between adjacent communication holes 8 is 7 mm. It becomes. From the viewpoint of processing the casing 6 in which the communication hole 8 is formed, P ≧ W + 2 is preferable, and from the viewpoint of promoting the air curtain effect, P ≦ W + 7 is preferable.

  FIG. 5 is an explanatory diagram for explaining the swirl flow of gas formed in the separation chamber 7 in the compressor with a built-in oil separator of the present invention. FIG. 5 (a) shows that the upper and lower communication holes 8a and 8b are sufficiently provided. When close, (b) has shown the case where the upper and lower communicating holes 8a and 8b are fully separated. In FIG. 5 (a), the oil-containing gas introduced from the lower communication hole 8b is affected by the air curtain effect caused by the swirling flow of the oil-containing gas introduced from the upper communication hole 8a. It turns toward the lower hole 9 side below the separation chamber 7. On the other hand, in FIG. 5 (b), a strong swirl flow is not formed above the opening of the lower communication hole 8b, and the influence of the air curtain effect is weak, so the lower communication hole 8b Therefore, a part of the oil-containing gas introduced into the separation chamber 7 swirls toward the gas passage 10 above the separation chamber 7, and as a result, the oil separation performance of the oil separator 12 decreases. Thus, although the size of the arrangement pitch P of the communication holes 8 affects the separation performance of the oil separator 12, as described in FIG. 4, the arrangement pitch P is set so as to satisfy the relationship of P ≦ W + 7. Thus, the air curtain effect as shown in FIG. 5A is exhibited rather than that in FIG. 5B, and the separation performance of the oil separator 12 is ensured.

  The structure of the compressor with a built-in oil separator according to the present invention can be applied to any type of compressor with a built-in oil separator, and is particularly suitable for a scroll type compressor.

It is a longitudinal cross-sectional view which shows the matching structure of the compressor with a built-in oil separator which concerns on one embodiment of this invention. It is a figure which shows the cross section of the compressor of FIG. 1, (a) is sectional drawing seen from the AA direction, (b) is sectional drawing seen from the BB direction. 3 shows a cross section of the separation chamber of the compressor of FIG. 2, (a) is a cross-sectional view of the separation chamber as viewed from above in FIG. 2, (b) is a crossing of the communication hole as viewed from the right side of (a). FIG. It is a figure explaining the arrangement pitch P of a communicating hole, and the up-down direction width W of each communicating hole, (a) is the figure which expanded the separation chamber vicinity of FIG.2 (b), (b) is FIG.3 (b). It is a figure corresponding to. In the compressor with a built-in oil separator of the present invention, it is an explanatory view for explaining the swirl flow of gas formed in the separation chamber, (a) when the upper and lower communication holes are sufficiently close, (b) Indicates a case where the upper and lower communication holes are sufficiently separated. The cross section of the separation chamber in the conventional compressor with a built-in oil separator is shown, (a) is a cross section of a separation chamber, (b) is a cross section of a communicating hole seen from the right of (a). is there.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor with built-in oil separator 2 Discharge chamber 3 2nd discharge chamber 4 Oil storage chamber 5 Fixed spiral body component member 6 Casing 7 Separation chamber 8, 18 Communication hole 8a, 18a Upper side communication hole 8b, 18b Lower side communication hole 9 Lower hole 10 Gas passage 11 Alignment position 12 Oil separator

Claims (11)

The oil-containing gas that is arranged adjacent to the discharge chamber and is entirely formed in the space is separated into gas and oil by centrifugation, and the separated oil is dropped downward, and the separated gas is In the compressor with a built-in oil separator, having a separation chamber extracted into the separation chamber, and a communication hole between the discharge chamber and the separation chamber for introducing the oil-containing gas from the discharge chamber into the separation chamber, the oil separator , the separation chamber, and the communication hole And a part of the inner wall surface of the communication hole at a position farther from the mating surface of the mating structure than the inner wall surface of the separation chamber , in the separation chamber side opening of the communication hole, to characterized in that most distance is the communicating hole to bite into the inner wall surface of the separation chamber in the vicinity of the long point is provided from the mating face Oil separator built-in compressor.   The compressor with a built-in oil separator according to claim 1, wherein the communication hole is opened at a portion of the inner wall surface of the separation chamber that is farthest from the mating surface of the mating structure.   The compressor with a built-in oil separator according to claim 1 or 2, wherein a plurality of the communication holes are arranged in the vertical direction.   The compressor with a built-in oil separator according to claim 3, wherein opening directions of the plurality of communication holes to the separation chamber are directed in the same direction.   The compressor with a built-in oil separator according to claim 3, wherein an opening direction to the separation chamber is changed for each communication hole. 6. The pitch P satisfies the following expression when the arrangement pitch of the plurality of communication holes is P [mm] and the vertical width of each communication hole is W [mm]. Oil separator built-in compressor.
W + 2 ≦ P ≦ W + 7   The compressor with a built-in oil separator according to any one of claims 1 to 6, wherein the oil separator has a lower hole through which oil separated in the separation chamber is led to an oil storage chamber located below the separation chamber.   The compressor with a built-in oil separator according to any one of claims 1 to 7, wherein the separation chamber is formed in a cylindrical shape in which a busbar portion extends linearly.   The compressor with a built-in oil separator according to any one of claims 1 to 7, wherein the separation chamber is formed in a cylindrical shape having a curved busbar portion.   The compressor with a built-in oil separator according to any one of claims 1 to 9, comprising a scroll type compressor, wherein one of the two members comprises a fixed spiral member and the other comprises a compressor casing.   The compressor with a built-in oil separator according to any one of claims 1 to 10, comprising a compressor for a vehicle air conditioner.

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